Fluorescence probe of 4-dimethylaminochalcone: Development and application of the optimum methodology for studying solvatochromic and solvatofluorochromic regularities

摘要

A new methodology for combined quantitative analysis of large arrays of solvatochromic and solvatofluorochromic data is used to determine a collection of the electrical, optical, and structural characteristics of the 4-dimethylaminochalcone (DMC) molecule in the first excited electronic state, corresponding to solvents of various polarities and chemical nature. It is shown that the degree of charge transfer under optical excitation of the dye is greater in aromatic solvents than in aliphatic solvents. This alters the dipole moment and polarizability of a molecule of the dissolved substance. Based on the resulting data, the absolute solvation shifts of the absorption and fluorescence bands of DMC accompanying the vapor-solution phase transition have been calculated, showing that the semiempirical theory proposed earlier by one of the authors adequately describes the photophysical phenomena being studied. (C) 2008 Optical Society of America.